1)
Molar mass of Cr2O3,
MM = 2*MM(Cr) + 3*MM(O)
= 2*52.0 + 3*16.0
= 152 g/mol
mass(Cr2O3)= 122.0 g
use:
number of mol of Cr2O3,
n = mass of Cr2O3/molar mass of Cr2O3
=(1.22*10^2 g)/(1.52*10^2 g/mol)
= 0.8026 mol
Molar mass of Si = 28.09 g/mol
mass(Si)= 197.0 g
use:
number of mol of Si,
n = mass of Si/molar mass of Si
=(1.97*10^2 g)/(28.09 g/mol)
= 7.013 mol
Balanced chemical equation is:
2 Cr2O3 + 3 Si ---> 4 Cr + 3 SiO2
2 mol of Cr2O3 reacts with 3 mol of Si
for 0.8026 mol of Cr2O3, 1.204 mol of Si is required
But we have 7.013 mol of Si
so, Cr2O3 is limiting reagent
Answer: Cr2O3
2)
According to balanced equation
mol of Si reacted = (3/2)* moles of Cr2O3
= (3/2)*0.8026
= 1.204 mol
mol of Si remaining = mol initially present - mol reacted
mol of Si remaining = 7.013 - 1.204
mol of Si remaining = 5.809 mol
Molar mass of Si = 28.09 g/mol
use:
mass of Si,
m = number of mol * molar mass
= 5.809 mol * 28.09 g/mol
= 1.632*10^2 g
Answer: 163.2 g
< CH7HW 11/07/19 di 12 out of 23 This is a Mixed question/It is worth 1...
Lequired HW 11/07/19 16 Question (1 point) The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr,0(s) +35i(s) — 4Cr(1) + 3Si0, (s) The reaction is begun with 98.00 g of Si and 78.00 g of Cr2O3- 1st attempt Part 1 (0.5 point) Select the limiting reactant. 15 OF 19 QUESTIONS COMPLETED < 16/19 > nk 12 pages Type here to search e ê 3 * Select the limiting reactant Choose one or more: В...
16 Question (1 point) The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr2O3(s) +35i(s) —— 4Cr(1) + 3Si0, (s) The reaction is begun with 146.00 g of Si and 85.00 g of Cr2O3. Part 2 (0.5 point) How many grams of the excess reactant are left after the reaction is complete?
16 Question (1 point) The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr,0g(s)+3Si(s) 4Cr()+3Sio, (s) The reaction is begun with 179.00 g of Si and 89.00 g of Cr2O3 7th attempt (0.5 point) Part 2 How many grams of the excess reactant are left after the reaction is complete?
The reaction of Cr2O3 with silicon metal at
high temperatures will make chromium metal. $$ The reaction is
begun with 134.00 g of Si and 130.00 g of Cr2O3.
The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr203 (s) + 3Si(s) —— 4Cr(1) +3510,(s) The reaction is begun with 134.00 g of Si and 130.00 g of Cr2O3. 1st attempt Part 1 (1 point) I See Periodic Table Select the limiting reactant. Choose one...
14 Question (1 point) @ See page 289 Chromium(III) oxide reacts with silicon as indicated by the balanced equation below. 2Cr,0, (s) + 3Si(s) — 4Cr(s) + 3Si0, () When 105.0 g Cr2O3 is reacted with 169.0 g Si, it is determined that Cr2O3 is the limiting reagent. 2nd attempt See Periodic Table See Hint If the reaction begins with 105.0 grams of Cr2O3 and 169.0 grams of silicon, how many grams of the excess reactant will be used? g...
21 Question (1 point) Chromium(III) oxide reacts with silicon as indicated by the balanced equation below. 2Cr,0, (s) +35i(s) — 4Cr(s) +3Si0,(s) When 95.00 g Cr203 is reacted with 119.0 g Si, it is determined that Cr2O3 is the limiting reagent. 1st attempt . See Periodic Table See Hint If the reaction begins with 95.00 grams of Cr2O3 and 119.0 grams of silicon, how many grams of the excess reactant will be used? g of Si used
The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal 2Cr2O3(s) +3Si() 4C(1) +3Si02(s) The reaction is begun with 53.00 g of Si and 80.00 g of Cr2O3. 1st attempt Part 1 (0.5 point) Select the limiting reactant. Choose one or more: si Cr2O3 SiO2 o cr
< CH7HW 11/07/19 12 out of 23 15 Question (1 point) These questions are based on the following balanced equation: 2H, +0, 2H,0 If you start with 6.833 g of H2 and 3.095 g of Oz, find the following: 1st attempt Part 1 (0.3 point) With excess O2, what mass of H2O would be produced by the H2? g H20 < 15/20 > acer esc CH7HW 11/07/19 12 out of 23 Part 2 (0.3 point) With excess H2, what mass...
The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr,0,(s) + 3Si(s) — 4Cr(I) +3510,(s) The reaction is begun with 83.00 g of Si and 117.00 g of Cr2O3. 3rd attempt Part 1 (1 point) l See Part 2 (1 point) * Feedback How many grams of the excess reactant are left after the reaction is complete? 100.8 2nd attempt 1st attempt
10/31/19 See page 289 15 Question (1 point) Chromium(II)oxide reacts with silicon as indicated by the balanced equation below. 2Cr,0,(s) +3Si(s) 4Cr(s) +3510,(s) When 155.0 g Cryog is reacted with 153.0 g Si, it is determined that Croy is the limiting reagent. 2nd attempt u See Periodic Table See Hint If the reaction begins with 155.0 grams of Cr2O3 and 153.0 grams of silicon, how many grams of the excess reactant will be used? gor Si used 35 OF 40...